Telephone system.



J. B. TAYLOR.

TELEPHONE SYSTEM. APPLIUATION FILED lfAY 3,1909.

962,800. 7 {Patented June 28,1910.

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Witnesses: ,Inve n'tgor:

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JOHN B. TAYLOR, 0F SCHENECTADY, NEW YORK,

COMPANY, A CORPORATION OF NEW YORK.

TELEPHQNE SYSTEM.

Specification of Letters Patent. 1 I Application' filed May a, 1909.Serial No. 403,5;1.

Patented June 28, 19 10.

To all whom it may comm! Be it known that. I JOHN B. citizen of theUnited 1 TAYLOR, a States, residing at Schenectady, county ofSchenectady, and

State of New York, have invented-certain new and useful Improvements inTelephone Systems, of which the following is a specification.

My invention relates to telephone systems, and has for its objectan'improvement in the operation of such systems.

At the present time electrical energy is frequently transmitted for londistances by means of conductors operate at a high voltage and carriedon suitable poles for towers. In many instances .these transmissionlines are adjacent to telephone circuits,

and it has been foundthat frequently they induce upon such circuitsf'ahlgh voltage 'WlllCl'l may subject p'ersonsusing the tele-.

phone apparatus to shockswhioh are not only annoying, but at timesdangerous. In order to avoid these high-voltage shocks, it

has been the custom to employ upon such repeatln'gtelephone circuitshigh-v0 tage coils, or telephone transformers which have two windingsinsulated from each other, one windin being connected to the telephonecircuit and the other tothe instruments. With such an arrangement thoseusing the instruments will be protected from any high voltage which maybe induced upon the telephone circuit, as the secondary wlnding of thesetransformers will be at a diiferent potential from that of the telephonecircuit. When a considerable numer of such repeating coils or telephonetransformers are used, however, difficulty is at times'experienced inproperly ringingthe telephone bells or signal ap aratus employed to givenotice that it is desired to send a telephonic communication. Thisdifliculty arises from the fact that the magnetos or tele honegenerators, which .may be used,

wh e of suflicient capacity to operate some bells and ransformers maynot be of capacity to provide a current sufiicient for.

ma a number of such-transformers an' alsofor ringing the 'be1ls,-that isto say. that when many 9i 'fll' g'fi n l lfi i are used too great a loadmay be put'upon the line for the capacity of the telephone generators,and considerable annoyance experienced through the improper rmging ofsuch bells.

The object of m invention than is to assrenon 'ro GENERAL amour-cprovidean improve method of operating a telephone systemwhich may besubjected to a high voltage and emp 0y repeatlng' coils or transformers,and st obtain a satisfac y used this object by permanently connectingthe bells across the telephone circuitandproviding connections such thatthe repeatinog coils or transformers are normally cut out circuit,-butare connected to the c'ireuitiu any particular station which desires tosend or receive messages. I A

For a further understanding vention reference may: be ha companyingdrawing, where Figure 1 shows the connections oommonl used for atelephone system operated wit repeating coils or transformers and Fig. 2shows the connections for a. tele hone system operated in accordancewit" my new invention.

dperation of the bells or other devices of my .in

Referring first to Fig. 1, 1 and 2 are the .to the acr signalingpurposes. I accomplish be used for the receiving and transmitting ofmessages. Conductors 1 and 2 may be adjacent t'o-a high-voltage electriccircuit, but such circuit has not been shown in the drawing. 3 isseparate windings insulated from each'other in a suitable manner. Oneof. these windings is connected to the telephone circuit by conductors1', 2 and the other Windin' 1s transformer having two connected toconductors 5 and 16. A bel or signal apparatus 4 is shown connected tofor ex'anipl e, to sendainessege from the 'conductors= 5 and 6.Conductors -5 and 6- number of 'such transformers are used, and.

frequently due to this fact be pro rly operated.

In I have shown connections for a telephone system in accordance with myinvention,-1- and 2 representing the conductors of the circuit. ThreeStations, A, B ancLCf, are shown, and transformers ti are shown for eachstation. Instead of these transformers the circuit, they switches 7through conductors 1, 2 to the circuit. Bell 4 is shown as connectedpermanently across the circuit by connecting it the bells-cannot (thebell) to conductors 1, 2.- Conductors beover 5 and 6 are connected tothe receiving and transmitt' instruments at the station in a mannersimilar to that described for Fig. l, but bell 4 is not directlyconnected to the circuit containing the receiving and transmittinginstruments, as shown by thedrawing. The 0 eration of such a system willthen be as fo ows: Normally switches 7 will be open. If it is desired tosend a message from any station, such as A, for cxamp e, the sendercloses'his switch 7 and sends a bell ringing signal byhis magneto ortelephone generator in the usual manner. This will cause the bells inthe various stations to ringin the usual manner, as they are connectedacross the circuit. The. magneto or tele hone generator, however, willnot oaded, as in Fig. 1, with more than its normal load when such asignal is sent, because the transformers 3 are not normally in circuitin the various telephone stations, and, therefore, the magnetos ortelephone generators do not have to energize these transformers. When asignal is sent a person in any station, such as 0, may close his switch7 and thus connect his receiving and transmitting apparatus '.-to thetelephone circuit, after which messages may be sent and received in theusual way between these sta tions. a

While I have shown all the stations as gnetos. f my new method: ofopcrating such a System are that, as explamed above, the magnetos ortelephone generators are not requirgd to ca an extraordina load, and,therefore, w' gperate the the switch being connected directly to areconnected by means of ment and connections for thethe other or signaevices in a satisfacto manner. A fu i't h i' advantage is that than tingcoils or transformers are out out o cu1t normall handle the receiving ora ratus, it may be done with perfect 8:: ety. The bell, which is thatportion of the telephone apparatus requirmg the least attention, may bepl in any desired locality and suitably insulated for nus, however,

may, if desired, be automatically operated when the receiver is takenofl the hook, so that the operation of the relay to the line would notrequire any additional operations to those at the present time.

While I have shown a certain arrangeout of my invention, I do not limitmysc to this am: ement or connection, but seek in the appen ed claimstocover all such arrangements and connections as will be obvious tothose-skilled in the art, and will be within the' scope of my invention.'WhatIclaiz'nasnew and desire to secure by Letters Patent is:

1. The combination in a telephone system of receiving and apparatus, atransmission circuit, a switch, a transformer having one windingconnected to the receiving and transmitting ap aratus and a secondwinding connected thronghthe switch to the transmission circuit, and abell conswitc p 2. The combination in a telephone system of receivingand transmittingapparatus, a transmission-circuit, a two-pole switch, ahighly insulated trans ormer having one winding connected to thereceiving and transmitting a aratus and the terminals of win 1ngconnected throu h the switch to the transmission circuit, 8.115 a bellconnected across the circuit between the circuit and the switch. 3. Thecombination in a telephone system of a-transformer, a transmissioncircult, receiving and transmittin apparatus connected to 'said circuitough, and protected by, the transformer, means for connecting thetransformer to and disconnecting it from the circuit, and a bellpermanently connected across the circuit.

4. The combination in a telephone system of a transformer having twowindings, re-

vnecteilL across the circuit between it and the ce1v1ng and transmittingapparatus con- ,nected to one winding-a.

transmlssion circult, means for to and disco an a bell circuit.

nnecting it m the circuit, permanently connected across the cir-v andhence, ifit is desired to connecting the other wind 5. The combinationin a telephone system the circuit, and a bell permanently connected of atransformer having two separate Windings insulated from each other by a,highvoltage insulation, receiving and transmitting apparatus connectedto one of the transformer windings, a transmission circuit, a two-poleswitch connecting the other transformer Winding to and disconnecting itfrom across the circuit.

In Witness whereof, I have hereunto set my hand this 1st day of May,1909.

JOHN B. TAYLOR. Witnesses: BENJAMIN B. HULL, HELEN OHFORD.

